Ferro-Concrete. 



397 



In reality the neutral axis always lies near the lower part of 

 the plate ; the hatched part of the girder, Fig. 4, in which small 

 compressive forces are still active, can simply be omitted without 



H 



1 

 I 



substantially affecting its strength. If we only want to determine 

 the reinforcement, the smallest possible value, namely, the distance 

 between the reinforcement and the centre of the ceiling plate can be 



